Question

X+6=(X-6)²
É trabalho

Answer 1

X+6=(X-6)²
X + 6 = X^2 - 2×6×X + 6^2
X+6= X^2 - 12X +36
X^2 - 13X + 42 = 0

DELTA
B^2 - 4×A×C
13^2 - 4×1×42
169 - 168
1

X= 13 +- 1 / 2
X1= 13 + 1/2
X1= 14/2= 7
X2= 13 - 1/2
X2= 12/2=6